SOURCE: what size spark plug for a 2000 harley davidson road king carbed,
Your Twin Cam plug should be a 6R 12 Harley Plug. Often times the back fire is just the nature of the beast depending on what type of pipes you are running. Harleys do run lean, its an EPA thing thtas why they choke them down from the factory. Since you have a carb you could have an intake leak around the Intake. Also Under the carb is an adjustment screw. Harley plugs it up so people don't play with it. You have to just drill out the plug this will set your air fuel. Whenever I take a carb off I drill out that plug. Heat your bike up operating temp and ear tune that screw. Only other way is with air fuel analizer or a dyno. good luck.also that backfire is caused by fuel hitting your exhaust when you let off just to let you know.
SOURCE: 1996 zx11 getting sprk to one bank only
Hi and welcome to FixYa,
The voltage on the green wire must be pulsating when cranking/starting the bike, not steady. Confirm by similarly testing the voltage on the black wire on the left ignition coil. If the green still reads a constant voltage, then the CDI is faulty; to be more specific, most likely that the switching tansistor inside the CDI that drives the right ignition coil has shorted.
Good luck and thank you for asking FixYa.
SOURCE: seeking drain plug location on 1999 classic road
the engine oil drain plug is on the right side almost in line with the end of the back cyclinder just under the exhaust make sure that it is the front plug (oil) not tranny
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Is your bike equipped with the stock ignition system? Both plugs should fire at the same time. How many small wire terminals do you have on the coil that you took off? Two or three? If you have only two, it's a dual fire ignition system. If the original coil had three connections, it was a single fire ignition. If the ignition system has been changed to a single fire and you've got a dual fire coil on it, it won't work. Look in the nose cone or under the seat for an aftermarket ignition box.
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